Griffiths Introduction to Elementary Particles · Problem 2.10

Relativistic Kinematics — David J. Griffiths

Physics — QFT · ozi-rule-particle-decays

Problem

The

\psi'

meson, at 3685 MeV/

c^2

, has the same quark content as the

\psi

(i.e.,

c\bar{c}

). Its principal decay mode is

\psi' \rightarrow \psi + \pi^+ + \pi^-

. Is this a strong interaction? Is it OZI-suppressed? What lifetime would you expect for the

\psi'

? (The observed value is

3 \times 10^{-21}

sec.)